Tube for short waves



April 4, W33.

Bf WIENECKE TUBE FOR SHORT WAVES Original Filed Mar ch s, 1935 FatentedApr. 4, 1939 UNITED STATES TUBE FOR SHORT WAVES Bruno Wienecke, Berlin,Germany, assignor to Radioaktiengesellschaft D. S. Loewe, Berlin-Steglitz, Germany Original application March 8, 1935, Serial No. 10,046.Divided and this application June 2'7,

1936, Serial No. 87,697. 1934 1 Claim.

In tubes for short waves, both for transmission as Well as foramplifying purposes, it is favourable to make the leads to theelectrodes as short as possible. In the case of comparatively longelectrodes the leads should be taken to the middle, so that the naturalWave will be as short as possible.

Tubes are known in which the lead of the grid is taken to its middlethrough an opening in the anode and the leads of the grid and of theanode are passed out towards opposite sides.

According to the invention, in order toobtain high emission the cathodeis made of more than two parallel filaments lying in a plane, andconsequently a grid of oval cross-section is used.

The present invention is illustrated by the accompanying drawing inwhich Fig. 1 is a longitudinal section through the tube, whilst Fig. 2is a side view.

In the drawing, l is the cathode, for an example consisting of 4parallel filaments, 2 the anode and 3 the grid, both of ovalcross-section. The lead 4 to the grid is connected to its mid- InGermany March 13,

zone and is passed through an opening in the anode. The lead 5 to theanode is also connected to its mid-zone. Both leads are conducted out ofthe bulb 9 at opposite sides.

The high-frequency leads 6--6 to the cathode are arranged perpendicularto the above leads and pass through the walls of the bulb at oppositesides whilst the heating current is conducted to the filaments via theplugs l and 8 arranged at the base of the bulb.

I claim:

A tube for short waves comprising a bulb, a cathode, a grid and ananode, a lead being conducted from the mid-zone of said anode outside ofsaid bulb, another lead being conducted from the mid-zone of the gridthrough an opening in the opposite side of said anode also outside ofthe bulb, and two plugs on the base of said bulb, the high-frequencyleads from said cathode being conducted out of said bulb perpendicularto said leads from grid and anode, the heating current conducting leadsto said cathode being connected to said plugs.

BRUNO WIENECKE.

